Multiplying digital-to-analogue converter

Details Multiplying digital-to-analogue converter Multiplying digital-to-analogue converter

1992-10-26

1994-11-29

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

341144, H03M 166

Patent

active

053694066

ABSTRACT:
A multiplying digital-to-analogue converter of the kind in which digitally weighted currents proportional to a voltage applied to an analogue input are generated at respective outputs of a current mirror arrangement. These currents are switched to an output in accordance with the value of a digital signal applied to a digital input. In order for the converter to accommodate an analogue input voltage of either polarity relative to ground and generate corresponding output currents, a bias current is applied to the current mirror input from a current source. This results in digitally weighted bias currents being generated at the current mirror outputs. These bias currents are offset by corresponding bias currents generated at respective outputs of a second current mirror arrangement.

REFERENCES:
patent: 4595912 (1986-06-01), Hoehn
patent: 4631522 (1986-12-01), Cabot
patent: 4914440 (1990-04-01), Ramet
patent: 4931795 (1990-06-01), Gord
IBM Technical Disclosure Bulletin, vol. 24, No. 5, (Oct. 1981) T. G. Cole and C. Smith, pp. 2342-2344.

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